welt vs flog

welt is a noun but flog is not a noun.

Word	Noun	Adjective	Verb	Adverb
welt	Yes	No	Yes	No
flog	No	No	Yes	No

As verbs, welt and flog are synonyms defined as:

Other synonyms of welt include lash, lather, slash, strap, trounce, whip.

welt (noun)	flog (noun)
a raised or strengthened seam
a raised mark on the skin (as produced by the blow of a whip); characteristic of many allergic reactions

welt (verb)	flog (verb)
put a welt on	beat severely with a whip or rod
beat severely with a whip or rod	beat with a cane